This thesis reports on the results of an experimental study investigating the resolution of intra-sentential anaphora and cataphora in Croatian in three native speaker groups English-Croatian professional translators, English-Croatian translation trainees and a control group of non-translators. The aim of the study was to investigate whether the professional translators and translation trainees were influenced by their use of and exposure to English, their L2, resulting in L1 attrition. The participants were administered a picture selection task in which they read sentences containing null and overt subject pronouns referring to an antecedent that came either before (anaphora) or after the pronoun (cataphora). After each sentence they had to choose between three pictures that showed the antecedent as the subject, the object or an extra-linguistic referent. The professional translators and the translation trainees did not select the subject as the overt pronoun antecedent more often than the control group in sentences with anaphor. In sentences with cataphora, the translation trainees selected the subject the least, while the professional translators selected it slightly more often than the controls. No evidence of L1 attrition was found.